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WITH year_total AS (
SELECT
c_customer_id customer_id,
c_first_name customer_first_name,
c_last_name customer_last_name,
c_preferred_cust_flag customer_preferred_cust_flag,
c_birth_country customer_birth_country,
c_login customer_login,
c_email_address customer_email_address,
d_year dyear,
sum(ss_ext_list_price - ss_ext_discount_amt) year_total,
's' sale_type
FROM customer, store_sales, date_dim
WHERE c_customer_sk = ss_customer_sk
AND ss_sold_date_sk = d_date_sk
GROUP BY c_customer_id
, c_first_name
, c_last_name
, d_year
, c_preferred_cust_flag
, c_birth_country
, c_login
, c_email_address
, d_year
UNION ALL
SELECT
c_customer_id customer_id,
c_first_name customer_first_name,
c_last_name customer_last_name,
c_preferred_cust_flag customer_preferred_cust_flag,
c_birth_country customer_birth_country,
c_login customer_login,
c_email_address customer_email_address,
d_year dyear,
sum(ws_ext_list_price - ws_ext_discount_amt) year_total,
'w' sale_type
FROM customer, web_sales, date_dim
WHERE c_customer_sk = ws_bill_customer_sk
AND ws_sold_date_sk = d_date_sk
GROUP BY
c_customer_id, c_first_name, c_last_name, c_preferred_cust_flag, c_birth_country,
c_login, c_email_address, d_year)
SELECT t_s_secyear.customer_preferred_cust_flag
FROM year_total t_s_firstyear
, year_total t_s_secyear
, year_total t_w_firstyear
, year_total t_w_secyear
WHERE t_s_secyear.customer_id = t_s_firstyear.customer_id
AND t_s_firstyear.customer_id = t_w_secyear.customer_id
AND t_s_firstyear.customer_id = t_w_firstyear.customer_id
AND t_s_firstyear.sale_type = 's'
AND t_w_firstyear.sale_type = 'w'
AND t_s_secyear.sale_type = 's'
AND t_w_secyear.sale_type = 'w'
AND t_s_firstyear.dyear = 2001
AND t_s_secyear.dyear = 2001 + 1
AND t_w_firstyear.dyear = 2001
AND t_w_secyear.dyear = 2001 + 1
AND t_s_firstyear.year_total > 0
AND t_w_firstyear.year_total > 0
AND CASE WHEN t_w_firstyear.year_total > 0
THEN t_w_secyear.year_total / t_w_firstyear.year_total
ELSE NULL END
> CASE WHEN t_s_firstyear.year_total > 0
THEN t_s_secyear.year_total / t_s_firstyear.year_total
ELSE NULL END
ORDER BY t_s_secyear.customer_preferred_cust_flag
LIMIT 100
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